pan and scrol works

chart.cpp

@@ -4,14 +4,13 @@
 #include <QtWidgets/QGraphicsView>
 #include <QLineSeries>
 #include <iostream>
+#include <QGraphicsSceneEvent>
 
 Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
     : QChart(QChart::ChartTypeCartesian, parent, wFlags)
 {
     // Seems that QGraphicsView (QChartView) does not grab gestures.
     // They can only be grabbed here in the QGraphicsWidget (QChart).
-    grabGesture(Qt::PinchGesture);
-    grabGesture(Qt::PanGesture);
     setContentsMargins(0, 0, 0, 0);
     setMargins(QMargins(0,0,0,0));
     setBackgroundRoundness(0);
@@ -24,9 +23,10 @@ Chart::~Chart() {
 bool Chart::sceneEvent(QEvent *event) {
     if (event->type() == QEvent::Gesture)
         return gestureEvent(static_cast<QGestureEvent *>(event));
-    std::cerr << "chart: Wheel!";
+    if (event->type() == QEvent::GraphicsSceneWheel) {
-    std::cerr << (event->type()) << std::endl;
+        QGraphicsSceneWheelEvent *swe = static_cast<QGraphicsSceneWheelEvent*>(event);
-
+        return myWheelEvent(swe);
+    }
     return QChart::event(event);
 }
 
@@ -44,10 +44,15 @@ bool Chart::gestureEvent(QGestureEvent *event) {
     return true;
 }
 
-void Chart::wheelEvent(QGraphicsSceneWheelEvent *event) {
+bool Chart::myWheelEvent(QGraphicsSceneWheelEvent *event) {
-    std::cerr << "chart: Wheel!";
+    bool in = event->delta() > 0;
-
+    bool scale_x = event->scenePos().x() > this->geometry().right()/4;
-    QChart::wheelEvent(event);
+    QRectF view = plotArea();
+    qreal zoom = 0.1;
+    qreal dwidth = view.width() * (scale_x ? (in ? -1.0 : 1.0) * zoom/2 : 0.0);
+    qreal dheight = view.height() * (scale_x ? 0.0 : (in ? -1.0 : 1.0) * zoom/2);
+    view.adjust(dwidth/2, dheight/2, -1.0 * dwidth/2, -1.0 * dheight/2);
+    this->zoomIn(view);
 }
 
 void Chart::XRangeChanged(qreal min, qreal max) {

chart.h

@@ -16,11 +16,11 @@ public:
     explicit Chart(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0);
     ~Chart();
 
-    void wheelEvent(QGraphicsSceneWheelEvent *event);
     bool sceneEvent(QEvent *event);
 
 private:
     bool gestureEvent(QGestureEvent *event);
+    bool myWheelEvent(QGraphicsSceneWheelEvent *event);
 
 public slots:
     void XRangeChanged(qreal min, qreal max);

chartview.cpp

@@ -6,60 +6,39 @@ ChartView::ChartView(QChart *chart, QWidget *parent) :
     QChartView(chart, parent),
     m_isTouching(false)
 {
-    setRubberBand(QChartView::RectangleRubberBand);
     setContentsMargins(0,0,0,0);
 }
 
 
-bool ChartView::viewportEvent(QEvent *event)
-{
-    if (event->type() == QEvent::TouchBegin) {
-        // By default touch events are converted to mouse events. So
-        // after this event we will get a mouse event also but we want
-        // to handle touch events as gestures only. So we need this safeguard
-        // to block mouse events that are actually generated from touch.
-        m_isTouching = true;
-
-        // Turn off animations when handling gestures they
-        // will only slow us down.
-        chart()->setAnimationOptions(QChart::NoAnimation);
-    }
-
-    return QChartView::viewportEvent(event);
-}
-
-void ChartView::wheelEvent(QMouseEvent *event) {
-    std::cerr << "Mouse event" << std::endl;
-    std::cerr << event->type();
-    //QChartView::whwheelEvent(event);
-}
-
 void ChartView::mousePressEvent(QMouseEvent *event)
 {
-    std::cerr << "MousePress" << std::endl;
+    if (event->buttons() & Qt::LeftButton) {
-    if (m_isTouching)
+        mouseDownPos = event->localPos();
         return;
+    }
     QChartView::mousePressEvent(event);
 }
 
 
 void ChartView::mouseMoveEvent(QMouseEvent *event)
 {
-    if (m_isTouching)
+    if (event->buttons() & Qt::LeftButton) {
+        QPointF diff = mouseDownPos - event->localPos();
+        qreal dx = event->localPos().x() - mouseDownPos.x();
+        qreal dy = event->localPos().y() - mouseDownPos.y();
+        mouseDownPos = event->localPos();
+        chart()->scroll(-1.0*dx,dy);
         return;
+    }
+
     QChartView::mouseMoveEvent(event);
 }
 
 
 void ChartView::mouseReleaseEvent(QMouseEvent *event)
 {
-    if (m_isTouching)
+    if (event->buttons() & Qt::LeftButton)
-        m_isTouching = false;
+        mouseDown = false;
-
-    // Because we disabled animations when touch event was detected
-    // we must put them back on.
-    //chart()->setAnimationOptions(QChart::SeriesAnimations);
-
     QChartView::mouseReleaseEvent(event);
 }
 

chartview.h

@@ -12,15 +12,15 @@ public:
     ChartView(QChart *chart, QWidget *parent = 0);
 
 protected:
-    bool viewportEvent(QEvent *event);
     void mousePressEvent(QMouseEvent *event);
     void mouseMoveEvent(QMouseEvent *event);
     void mouseReleaseEvent(QMouseEvent *event);
     void keyPressEvent(QKeyEvent *event);
-    void wheelEvent(QMouseEvent *event);
 
 private:
     bool m_isTouching;
+    bool mouseDown;
+    QPointF mouseDownPos;
 };
 
 #endif // CHARTVIEW_H

mainwindow.cpp

@@ -25,11 +25,11 @@ MainWindow::MainWindow(QWidget *parent) :
     DataLoader *loader = new DataLoader();
     loader->moveToThread(&dataQueue);
     dataQueue.start();
-    file = nix::File::open("/home/grewe/zwischenlager/2017-08-17-af-invivo-1/2017-08-17-af-invivo-1.nix",
+    //file = nix::File::open("/home/grewe/zwischenlager/2017-08-17-af-invivo-1/2017-08-17-af-invivo-1.nix",
-                           nix::FileMode::ReadOnly);
+    //                       nix::FileMode::ReadOnly);
 
-    //file = nix::File::open("/Users/jan/zwischenlager/threading_test/dataservice/data/2017-08-17-af-invivo-1.nix",
+    file = nix::File::open("/Users/jan/zwischenlager/threading_test/dataservice/data/2017-08-17-af-invivo-1.nix",
-    //nix::FileMode::ReadOnly);
+                           nix::FileMode::ReadOnly);
     nix::Block b = file.getBlock(0);
     this->voltage = b.getDataArray("V-1");
     this->eod = b.getDataArray("EOD");